Valve disk



FIG. 1 is a front view of a valve disk showing my new design, the rear, left side and right side views being the same;

FIG. 2 is a front perspective view of FIG. 1;

FIG. 3 is a top view of FIG. 1; and,

FIG. 4 is a bottom view of FIG. 1. 

CLAIM The ornamental design for a valve disk, as shown and described. 